Daosch



Dec. 22, 1959 E DAUSCH SUPPORT FOR THE UPPER RbLLER-CARRYING ANDLOAD-APPLYING ARM OF THE DRAFTING MECHANISM OF SPINNING MACHINES FiledMarch 20, 1958 United States Patent SUPPORT FOR THE UPPERROLLER-CARRYING AND LOAD-APPLYING ARM OF THE DRAFT- ING MECHANISM OFSPINNING MACHINES Ernst Daiisch, Stuttgart, Germany, assignor to SKFKugellagerfabriken Gesellschaft mit beschrankter Haftung, Schweinfurt,Germany, a corporation of Germany Application March 20, 1958, Serial No.722,792

Claims priority, application Germany March 23, 1957 5 Claims. (Cl.19-135) This invention is for improvements in or relating to textiledrafting mechanism, and is concerned with mech with the bottom roils, orshould have the opportunity of bein able to align themselvesautomatically in this position. In drafting mechanisms in whichindividual guide arms, which are received for lateral swinging movementinside a top-roll carrier-and-weighting arm, are provided to receive thetop rolls, the automatic alignment of the top rolls parallel to thebottom rolls is assured in every operating position of thecarrier-and-weighting arm.

On the other hand, in drafting mechanism wherein the top rollcarrier-and-weighting arm, which is pivotally articulated to a bracket,is provided with rigid saddleshaped holders for twin top rolls, it isnecessary to secure and, t

align the brackets on the supporting bar in such a manner that the axesof the twin toprolls are parallel with those of the bottom rolls. Thispresupposes not only a stable construction of the brackets but also anaccurate align ment thereof on the supporting bar. It has been foundthat the brackets can alter their position during operation, as a resultof which the position of the carrier-and-weighting arm is also altered,so that the top rolls are no longer parallel to the bottom rolls andtherefore operate faultily. Since minor deviations of the top rollcarrier arm cannot be immediately detected, but nevertheless unfavorablyaffect the yarn being processed, this construction is not satisfactory.Moreover, exact realignment of the brackets on the supporting bar in theevent of displacement, involves a heavy expenditure of time and labor.

It has already been proposed to arrange that the portion of the carrierarm receiving the top rolls should be mounted for lateral swinging inorder thus to be able to compensate for any variations in the positionof the brackets. For this purpose, hearings were provided in the form ofbolts engaging through bores in the swinging portion of the carrier arm.This construction was un satisfactory, however, because heavy frictionalforces develop at the bearing positions which interfere with the correctlateral swinging of the part carrying the top rolls, and in additionlead to premature Wear of the bearing members. With heavy top rollweighting pressures, therefore, such a construction necessitatesfrequent changing of the bearing members, so this construction isexpensive in operation.

It is an object of the present invention to overcome the above mentioneddisadvantages and to provide a drafting mechanism of great reliabilityand long life, which is simple to manufacture, and which rendersposisible automatic alignment of the top and bottom rolls ice regardlessof the position of the bracket on the supporting bar.

According to the invention, this object is achieved by arranging thatthe bracket is divided substantially parallel to the plane of thedrafting field in such a manner that the lower portion, which is securedto the supporting bar, is held against lateral swinging movement, andthe upper portion, which carries the top roll carricrarm, is soconnected to the lower portion as to be able to swing laterally. Thisarrangement renders a construction of the top roll carrier arm possiblewhich is resistant to mechanical stresses and ensures a reliable andaccurate alignment of the top rolls with the bottom rolls with theiraxes parallel, even if the setting of the bracket on the supporting bardeviates widely from the normal position. As it is possible to determinethe position of the individual top rolls inside the carrier arm in sucha manner that their axes are parallel to one another even in the eventof displacement, the mounting of the brackets on the supporting bar canbe effected quickly, without complicated adjustment, because the toproll carrier arm quickly aligns itself automatically to the correctposition.

According to the invention, bearings for accommodating the swingingmovement may be arranged between the upper and lower portions of thebracket, which bearings are situated substantially on the level of theaxes of the top rolls when in the operating position. In order to reducethe bearing friction to a minimum and to eliminate forces whichinterfere with automatic alignment of the top rolls with the bottomrolls with their axes parallel, the bearings preferably consist ofrolling bodies received between thrust plates. The thrust plates mayeither be formed integral with the bracket portions or as additionalplates secured to holding surfaces on the bracket portions. It isadvantageous to form the holding surfaces by slots in the bracketportions or by lugs bent from the bracket portions.

The swinging movement of the carrier arm may take place about a pointwhich may conveniently be formed by a bearing ball, the carrier armresting on a further bearing. This bearing may be formed in such amanner that it permits a movement of the carrier arm substantially onlyin a plane parallel to theplane of the drafting field. It is convenientto arrange that a web, which connects the sides of the upper bracketportion carrying the top roll carrier arm, is constructed in the form ofa thrust plate with a bearing point on which latter the ends of thesides of the lower bracket portion, secured to the supporting bar, restwith point or line contact.

One embodiment of the invention is illustrated by way of example in thedrawing, in which:

Figure 1 shows a drafting mechanism with a top roll carrier armpartially in elevation and partially in longitudinal section;

Figure 2 is a section on the line 2-2 in Figure 1;

Figure 3 is a section on the line 3-3 in Figure l, and

Fig. 4 is a side elevational view on a reduced scale of the draftingmechanism.

A bracket is secured in the usual manner by means of a tightening bolt 2to a supporting bar 1 which extends along a drafting machine. Thebracket consists of two portions 3 and 4 which are each bentsubstantially into the cross-sectional form of a U, the upper portionreceiving a pivot pin 5 for the pivotal mounting of a top roll carrierarm 6, which can be locked, in the operating position, by means of areleasable latching device 6', to the upper portion 4 of the bracket.The carrier arm a carries weighted top rolls 7 which co-operate withbottom rolls 9, and the relative distance between the top rolls 7 can bealtered by displacement of their respective carrier rails 8.

As shown particularly in Figure 2, the bracket portions 3 and 4 overlapadjacent to the top rolls 7, and a thrust plate is received in recesses11 in the portion 4 and extends through slots 12 in the portion 3. Theends 3 of the sides of the portion 3 are bent over to engage around athrust plate 13. Arranged between the plate 16 and the plate 13 areballs 15. which are guided by a cage 14 and which roll on the plate 10in the event of the arm 6 swinging laterally. At the rear side adjacentto the pivot pin 5, the ends 3 of the sides of the portion 3 are broughtclose together and, if necessary, secured together. They rest on a boss16, which is pressed out of the web 4 of the portion 4, withsubstantially point or line contact, the boss 16 forming a cup toreceive a ball 17 which rests in a recess in a thrust plate 1%. Theplate 18 is secured to bentover lugs 19 on the portion 3. The portion 4is covered by a fitting 20 of sheet metal or the like, in the form of ahood which extends over part of the portion 3 and forms part of thecarrier arm. At its rear end, the fitting 20 carries a spring 21 whichengages the plate 18 and web 4' when the arm 6 is raised and thuslocates the arm 6 in its upper, inoperative, position, as shown inbroken lines in Fig. 1.

The mounting of the drafting mechanism is effected in such a manner thatthe portion 3 is secured by means of the bolt 2 to the supporting bar 1,precise right-angled adjustment in relation to the supporting bar beingunnecessary. The portions 3 and 4 form a unit, the portion 4 receivingthe carrier arm 6 to pivot on the bolt 5. The mode of operation inservice is as follows: After the carrier arm 6 has been swung downtowards the bottom rolls 9 and locked to the portion 4, and if necessaryalso to another part of the machine, automatic lateral swinging tosettle into position takes place about the bearing point formed by theball 17. In the course of this, the balls 15 roll on the plate 10 andtransmit the pressure of the usual springs 7' which weight the top rolls7, see Fig. 1, through the plate 13 to the portion 3 on the supportingbar 1. It can be seen that even with extreme deviations from the correctsetting of the porion 3 on the supporting bar 1, the arm 6 will swingaccurately and rapidly into proper setting, because this movement isassisted to a great extent by the leverage provided by the distance ofthe bearing point of the ball 17 from the axis of the front pair of toprolls.

As already mentioned, the embodiment illustrated is only an example ofthe invention which is not restricted thereto. Instead, manymodifications and alterations are possible. This applies both to themounting of the thrust plates on the portions 3 and 4 of the bracket andto the form and arrangement of the bearings. The thrust plates may beintegral wtih the bracket portions.

1 claim:

1. In textile drafting mechanism of the type comprising top and bottomrolls, a supporting arm for the top rolls adapted to be raised andlowered from and into operative position and self-adjustable laterallywhen in said position, means for releasably locking the arm in theoperating position, and a bracket on which the said arm is mounted, saidmechanism being characterized by the fact that the said bracket isdivided into upper and lower portions with means for uniting saidportions affording freedom for relative self-adjustment thereof in aplane substantially parallel to the drafting field defined by the upperand lower rolls about a pivot normal to said plane, the lower portion ofthe bracket being relatively fixed, and means for mounting the saidroll-supporting arm on the upper relatively movable portion of thebracket.

2. A drafting mechanism as claimed in claim 1 including bearings betweenthe upper and lower portions of the bracket to accommodate said relativemovement, said bearings being arranged substantially on the level of theaxes of the top rolls when the latter are in the operating position.

3. A drafting mechanism as claimed in claim 2, characterized in that thebearings consist of rolling bodies arranged between thrust plates.

4. A drafting mechanism as claimed in claim 3 wherein one of saidbearings constitutes a pivotal connection for the bracket portions aboutwhich the said relative movement takes place.

5. A drafting mechanism as claimed in claim 4 wherein the thrust platesfor said pivot hearing are carried respectively by the bracket portions,and wherein the said lower portion of the bracket has an extension whichoverlies and vertically confines the thrust plate of the upper bracketportion.

References Cited inthe file of this patent UNITED STATES PATENTS Raibleet al Apr. 20, 1954

